Sanyo AVD-8501, Service Manual

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TROUBLE SHOOTING
(This is a basic waveform check.)
POWER SUPPLY;STANDBY mode
IC601 ACTIVE/ P-CON ; LOW
+5V/+12/-30/FIL ; OFF
STANDBY LED
LIGHT
STANDBY LED
LIGHT
STANDBY LED
OFF
POWER KEY
PRESS
POWER KEY
PRESS
IC801 CLOCK
IC801/FLASH
IC812
SYSTEM RESET
INITIALIZE
ADAC(IC131)
ALL POWER ACTIVE
-30v, 5V POWER
ONLY
AC-CORD PLUG
P-CON ; HIGH
+5V/+12/FIL ; ON
IC601 STANDBY DATA WAITE
STANDBY LED OFF
FROM MPUSTANBY DATA SEND
IC601 STADBY DATA RCVD
IC601 POWER ON DATA SEND
INITIALIZE
ADAC(IC817)
NG
NG
NG
NG
NG
NG
NG
NG
NG IC601,VDD/RESET/OSC CONFIRM
IC601 COMMUNICATION CONFIRM
STANDBY LED PERIPHERAL CIRCUIT CONFIRM
P-CON/+5V CONFIRM
START system check (DETAIL 1)
IC601,VDD/OSC CONFIRM
IC601 COMMUNICATION CONFIRM
STANDBY LED PERIPHERAL CIRCUIT CONFIRM
START system check (DETAIL 1)
POWER KEY CONFIRM
LED PERIPHERAL CIRCUIT CONFIRM
P-CON/+5V/+12/FIL CONFIRM
POWER KEY CONFIRM
STANDBY LED PERIPHERAL CIRCUIT CONFIRM
COMMUNICATION LINE CONFIRM
REMOCON NG -> IC801 PERIPHERAL CONFIRM
REMOCON OK -> IC601 PERIPHERAL CONFIRM
RESET LOADER AND
CHIPS
READ/WRITE DATA
IN EEPROM
(IC815)
START
COMUNICATION
WITH VFD
VFD
INDICATE
"READING"
INITIALIZE
MPEG DECORDER
(IC801)
DISPLAY
OPENNING
DISC Y/N
VFD
INDICATE
"NO DISC"
START CONTROL OF
LOADER
PICK INITIALIZE
SPINDLE ROTATE
N Y
PLAYBACK mode
RESET (IC812) CONFIRM
VDD/CLOCK CONFIRM
IC801 PERIPHERAL CONFIRM
IIC BUS LINE CONFIRM
IC601 VFD PERIPHERAL CONFIRM
-30V FILAMENT VOLTAGE CONFIRM
COMMUNICATION LINE CONFIRM
IC801, 802, 803 BUS-LINE CONFIRM
IC804, 805 BUS-LINE CONFIRM
LOADER CONFIRM
COMMUNICATION LINE CONFIRM(FFC)
FOR EU
DVD-7201, 9201, 9501
/UK, XE
EXCEPT EU
DVD-7201, 9201, 9501
/US, CA, SS, AU
DVD-DWM-370/US
after 1sec
after 1sec
DRAM ACCESS
IC601
COMMNICATION
IC601 RESET
IC601 ACTIVE
X6000 CLOCK
General flow